Machine for trimming



UNITED STATES PATENT OFFICE.

IV. H. ROUNDS, OI CAMIBELLO, MASSACHUSETTS.

MACHINE FOR TRIMMING, CHAMFERING, AND SKIVING LEATHER.

Speccation of Letters Patent No. 27,073, dated February 7, 1860.

To all 'whom it may concern:

Be it known that I, IV. H. RoUNos, of Campbello, in the county ofPlymouth and States of Massachusetts, have invented a Machine forTrimming, Chamfering, and Skiving Leather, of which the following is afull, clear, and exact description, reference being had to theaccompanying drawing, making part of this specification, whichrepresents a perspective view of the machine.

In the manufacture of boots and shoes, the back after being cut to apattern, has the lining pasted on it and then is trimmed by hand, theedge of the leather being chamfered off or beveled when to be sewn byhand and cut square when to be sewn on a sewing machine.

To facilitate this work I have invented a machine which I will nowproceed to describe in such a manner that others skilled in the art mayunderstand and use my inven tion.

In the said drawing, A, a bed or table on the under side of which,supported in suitable bearings is a shaft B, carrying at one end a handwheel C, and at the other end a notched or serrated feed wheel D, whichprojects a short distance through a slot in the table A. An arm E,rising from the table A, carries at its outer end a rod F, which slidesup and down in the end of the arm and is pressed down toward the tableby a coiled spring a (shown dotted). A screw Z9, passes through a slotin the end of the arm into the rod F; this rod carries at its lower enda presser roll or wheel G which revolves on an axle in the end of therod and in the same plane as the feed wheel D upon which it presses, orupon the leather to be trimmed. This gives the rough surface of the feedwheel a hold upon the leather which is carried through the machine asthe hand wheel C is turned. A segment H having a slot c, in it, issecured at d, to the top of the table. A block I, which fits to theinner curve of the segment H, is held in place after being adjusted by ascrew e, which passes through the slot c, the head of the screw beinglarger than the width of the slot. The shank of a knife f passes upthrough a suitable hole in the block I, and is secured in position by ascrew z' which passes through the side of the block. A

guard K, is secured to the top of the table by a screw and slot at g,and is adjusted so that its edge at Z, shall rest against the edge ofthe knife f. A guide L, is secured to the table by a screw and slot ath, and extends over the guard K. It has a notch m cut in its undersideat the front of a sufficient depth to allow the leather to be passedbeneath this guide which is adjusted in position so that the shoulder atthe back of the notch m, shall be far enough back for the knife f totake oif a shaving of the required width from the leather. Then theblock I, is in the position shown in the drawing the edge of the knifef, will be perpendicular to the table A, and will cut the edge of theleather square, but when it is required to chamfer or bevel the edge ofthe leather the screw e, is loosened and the block I, is moved fartherdown the segment I-I, until the required inclination of the knife isobtained when the screw e is again tightened up. As the knife f isground away the guard K is moved up to it.

The following is the operation of this machine: The parts having beenproperly adjusted, the operator standing at the front of the machinepasses the piece of leather to be trimmed, under the guide L the edge ofthe leather being pressed up against the shoulder of the notch m, thewheelC, being turned in the direction of its arrow the leather iscarried by the feed wheel D past the edge of the knife 7, which takesoff a narrow shaving leaving the edge either square or beveledaccordingto the position of the block I; the trimming being done withmuch greater accuracy and uniformity and with less expense of time andlabor than when cut by hand as heretofore.

I have heretofore spoken of this machine as used for trimming parts ofboots and shoes before they are sewn up, but it is evident that it maybe employed to trim leather for other manufacturesnfor example, forharness making.

The segment I-I, is struck from a center where the point of the knife f,touches the table A. This leaves the point of the knife in the sameposition although the inclination of the blade may be changed.

For skiving leather the guide L is removed and a knife O (detached inFig. 2,) with its guard S is adjusted and secured in of the block I.

its piace, the leather is then passed between this knife and its guardS, when the feed Wheels D, G draw it through as before, or the knife fmaybe used for this purpose by moving the block I stili farther down onthe segment I-I (part of which projects beloW the table as shown dotted)until the edge of the knife makes an acute angle With the face of theguard K, the point of the knife pointing upward, and the shank beingthrust farther through the block I, an opening Z is formed in the tablefor the passage Vhave the range of adjustment represented,

to adapt the machine to the Varied purposes 20 mentioned substantiallyas described.

W. H. ROUNDS.

Witnesses:

THos R. RoAoH, P. E. TESCHEMACHER.

